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Make log merge wait timeout tunable

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Add a mount option for the amount of time that log merge creation can
wait before giving up.  We add some counters so we can see how often
the timeout is being hit and what the average successfull wait time is.

Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2024-01-25 11:25:56 -08:00
parent f654fa0fda
commit 90a4c82363
5 changed files with 97 additions and 13 deletions
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utils/man/scoutfs.5
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@@ -55,6 +55,19 @@ with initial sparse regions (perhaps by multiple threads writing to
different regions) and wasted space isn't an issue (perhaps because the
file population contains few small files).
.TP
.B log_merge_wait_timeout_ms=<number>
This option sets the amount of time, in milliseconds, that log merge
creation can wait before timing out. This setting is per-mount, only
changes the behavior of that mount, and only affects the server when it
is running in that mount.
.sp
This determines how long it may take for mounts to synchronize
committing their log trees to create a log merge operation. Setting it
too high can create long latencies in the event that a mount takes a
long time to commit their log. Setting it too low can result in the
creation of excessive numbers of log trees that are never merged. The
default is 500 and it can not be less than 100 nor greater than 60000.
.TP
.B metadev_path=<device>
The metadev_path option specifies the path to the block device that
contains the filesystem's metadata.